I have a “ground source heat pump” (a long pipe zig zagging under my lawn at about 2-3 foot depth) and kinda sandy soil and nobody mentioned no water table and

I have a “ground source heat pump” (a long pipe zig zagging under my lawn at about 2-3 foot depth) and kinda sandy soil and nobody mentioned no water table and it works great. Sand is not ideal but it’s not a blocker. The most common heap pumps use bore holes straight down into the rock here in Sweden, but lateral installs are marginally better performance (sun reheats soil every summer) if you have a big garden. Heap pumps dominate in Sweden so the installers have a lot of confidence and give good practical advise.